A coenzyme C₂₁H₂₈N₇O₁₇P₃ of numerous dehydrogenases that occurs esp. in red blood cells and plays a role in intermediary metabolism similar to nicotinamide adenine dinucleotide but acting often on different metabolites.

烟酰胺腺嘌呤二核苷酸磷酸辅酶 II(多种脱氢酶的一种辅酶，主要在红血球细胞中出现，在中间代谢中作用与辅酶 I 相同，但常作用于不同代谢物)。